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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a1a9f6f89cc3bfebb3b4e28edd3b4822fa88c8f02c2cec5f65782ccceb7bdf' 
  AND token = 'HHFW/7zgWflDMauXT/cGNX85ls+s+i/e0ISK55N3dug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}